As to appearance - neither the MP5 or the Sub wins any beauty contest (although the Sub is so fugly that it's cute ). That tiara belongs to the Beretta.
As noted the range of optics for the Sub is limited, options for style are limited, but I don't think anyone knows if the MP5 is more durable or accurate than the Sub because no one has tested them to the same criteria (that I'm aware of). This "of course" verges on snobery since none of us know or knows anyone that does know which is the better gun. The idea of comparing the two is so silly on the face of it that it merits consideration. Trouble is I'm not will to test my Sub to destruction nor do I know anyone else that has an MP5 that's willing to test theirs to that point either.
As noted the range of optics for the Sub is limited, options for style are limited, but I don't think anyone knows if the MP5 is more durable or accurate than the Sub because no one has tested them to the same criteria (that I'm aware of). This "of course" verges on snobery since none of us know or knows anyone that does know which is the better gun. The idea of comparing the two is so silly on the face of it that it merits consideration. Trouble is I'm not will to test my Sub to destruction nor do I know anyone else that has an MP5 that's willing to test theirs to that point either.